mirror of
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60 lines
2.0 KiB
C++
60 lines
2.0 KiB
C++
/*************************************************************************
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* UrBackup - Client/Server backup system
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* Copyright (C) 2011-2016 Martin Raiber
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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**************************************************************************/
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#include "ECDHKeyExchange.h"
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#include "../Interface/Server.h"
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using namespace CryptoPPCompat;
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ECDHKeyExchange::ECDHKeyExchange()
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{
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CryptoPP::ECDH< CryptoPP::EC2N >::Domain ecdh(CryptoPP::ASN1::sect233k1());
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CryptoPP::AutoSeededRandomPool rng;
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priv.resize(ecdh.PrivateKeyLength());
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pub.resize(ecdh.PublicKeyLength());
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ecdh.GenerateKeyPair(rng, priv, pub);
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}
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std::string ECDHKeyExchange::getPublicKey()
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{
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return std::string(pub.BytePtr(), pub.BytePtr() + pub.size());
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}
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std::string ECDHKeyExchange::getSharedKey( const std::string& other_public )
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{
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CryptoPP::ECDH< CryptoPP::EC2N >::Domain ecdh(CryptoPP::ASN1::sect233k1());
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if(other_public.size()!=ecdh.PublicKeyLength())
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{
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Server->Log("Public key length does not match", LL_ERROR);
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return std::string();
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}
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std::string ret;
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ret.resize(ecdh.AgreedValueLength());
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if(!ecdh.Agree(reinterpret_cast<byte*>(&ret[0]), priv, reinterpret_cast<const byte*>(other_public.data())))
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{
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Server->Log("Failed to agree to ECDH shared secret", LL_ERROR);
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return std::string();
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}
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return ret;
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}
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